Most users who are using the Custom Source Categories setting in Preferences
(Current Project Options=>Other) have their project Source Types initialized
(Tools=>Source Types [Initialize] button) to the Evidence (E. S. Mills)
option although some few have their project Source Types initialized to the
Cite Your Sources (Lackey) option.

The Lackey option provides Source Types based on fourteen models given in the
older 1980 book while the Mills options provides over one hundred Source Types
based on the 1997 book. While there are similarities between the Source
Types of the two Source Categories, the major difference is that the Mills
Source Types tend to be specific to a single document while the Lackey Source
Types tend to be more generic and can often apply to multiple similar documents
(especially with minor adjustments).

Users should select one or the other of the two Source Categories and base
their Source Definitions on the Source Types of that Source Category for the
sake of consistency. But, it is believed that user can learn more about
source citations in TMG from comparing the Source Types of Lackey with those of
Mills. This can be done by temporarily creating a special project and initializing the
Source Category to Lackey if they already use Mills or vice versa.
However, some users may wish to have both Source Categories in the same project
to make the comparison easier. This can be done easily by exporting the
Source Types from a project using the normally unused Source Category and then
importing that file into a project with the normally used Source Category.
Exporting and importing is done by clicking on the [Export]/[Import] buttons in
the Source Types window (Tools=>Source Types).

The downside of having both Lackey and Mills Source Types in the same project
is that it is not easy to distinguish between the names of the Source Types.
For this reason, I have edited the normal names of the Source Types for the two
Source Categories by prefixing each with an "L" (Lackey) or "M" (Mills).
Then I exported the Source Types into two files:
Lackey and
Mills which may be downloaded and
imported to your project.

When you download either or both files, you should place it/them in the
Export folder of the User Data Files folder (normally in the user's MyDocuments
(WinXP) or Documents (WinVista) folder). This makes the file(s) easily
visible when you start importing although you can place the file(s) anywhere
with a little browsing effort during import.

After downloading the file(s), you must re-name it/them so that the
file extension is changed from "zip" to "xst".

Note there are differences in the design style of Mills and Lackey. As
noted above, some of this difference allows for Lackey Source Types to more
easily be adapted for multiple sources or for generic sources.
Another difference is in how the Bibliographies of some Mills Source Types sort
compared to the corresponding Lackey Source Types. This sort difference is
mainly for unpublished Source Types although others are also affected.